Question

How many protons, neutrons and electrons does the following cation of Beryllium (Be) have?
Be with a 2+ charge, (Be)^2+

Answer 1

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So... for the element of BERYLLIUM, you already know that the atomic number tells you the number of electrons. That means there are 4 electrons in a beryllium atom. Looking at the picture, you can see there are two electrons in shell one and two in shell two. ► More about the history and places to find beryllium.